Wrench



J. B. NEWLON AND C. BACKINGER.

WRENCH.

APPLICATION FILED SEPT 25. 1919.

Patented Aug. 31, 1920,

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LG. y Wm W M. A wam 7 a Em XR w UNITED STATS PA'EEN WRENCH. 1

. Application filed September 25, 1919. Serial No. 326,120."

To all whom it may concern p Be 1t known that we, JA ES B. NnwLoN and CHRISTIAN BAOKINGER, cltizens of the United States, residing at Seattle, in the county of King and State of 7Washington, have invented certain new and useful Improvements in Wrenches, of which the following is a specification.

This invention relates to monkey-wrenches or the like.

The object of our invention is to simplify and improve the construction of wrenches of this character to enable the same to be more readily adjustable and more durable and efficient in operation.

lVith these and other objects in view the invention consists in the novel construction, adaptation and combination of parts as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a view partly in sideelevation and partly in longitudinal section of a wrench embodying our invention, shown applied. Fig. 2 is a similar view with the movable jaw and associated parts in disengaged positions.

i Fig. 3 is a fragmentary plan View of the wrench stock member. Fig. 4 is a sectional view taken through l4: of Fig. 2. Fig. 5 is a side 'elevational view of the movable jaw member shown detached.

Referring to said drawings, the numeral 10 designates the shank 'provided with the usual stationary jaw 11 at one end and having its other end socketed in a handle 12.

The shank 10 is provided with a series of rack teeth 13 on the side edge 14: from which the jaw 11 projects. 7 Y

15 represents a block or movable jaw having openings 16 through which the shank extends.

To the rear of the jaw proper, indicated I by 17, the block 15 is chambered as at 18 between side walls 19.

The front end of the chamber 18 is of an arcuate shape, the upper portion 20 being unserrated while the lower portion is provided with teeth 21 which are desirably spaced at less distances apart than those of shank rack.

22 represents thumb lever extending into the block chamber as shown and is fulcrumed by a pin 23 to the sidewalls 19.

The arm of the lever within the block chamber is bifurcated and located therein is a spur-wheel 24.- having peripheral teeth adapted to engage the teeth of both the Specification of Letters Patent. Patented AU -31, 1920- shank rack and thoseof the movable j aw.

The WY/11661124518 mounted on an axle 25 whose ends extend through slots26 of the lever bifurcations 27 into slots 28 provided 111 the side walls 19 of the block, More parranged in inclined relations to the block slots so" that 'when' the inner'end' of the thumb lever is raisedor lowered the slots thereof will serve as cam elements to cause the spur wheel to be Inovedinto and out of engagement with the jaw teeth 21 as respectively represented in Figs. 1 and 2. It is to be noted that in such movements the ticularly, the slots 28 of the :block are arranged parallel, or nearly so,{with' the axis of the shank, and the lever slots 26 are arblock slots 28 act through the medium of axle 25 to maintain the teeth of the spun wheel in continuous mesh with the shank rack.

Assuming the spur wheel 24 to be in the relative position'in which it is illustrated in Fig. 2, the movable jaw may be moved freelyupon' the shank 10 toward or from the stationary. jaw 11.:

.When the movable jaw has been brought into a selected-position, as shown for ex ample against a nut in Fig. 1, the/operator pushes down against the outer end of thumb lever 22 causing the bifurcated ,inner end to be swung upwardly whereupon the slots,

26 act as cams to urgethe spur wheel 24 forwardly into engagement with the portions 20 and 21 of the arcuate forward end of block chamber 18.

With the spur wheel thus engaged, such toothed portion 21 serves to prevent the rotation of the spur wheel thereby locking the block to the shank, the unserrated portion 20 serves as a bearing against the spur wheel and through which is imparted any thrust received from the. movable jaw di rectly to the shank 10 and relieves the axle 25 and block walls 19 of strains. i

The invention will, it is thought be understood from the foregoing description of the preferred embodiment of our invention. It.

is apparent though that the invention is not necessarily limited thereto, as various changes in the shape, proportions and arrangement of the parts may be made without departing from the principle of the invention and'within the scope'of the appended claims. I

What we claim, is- V 1. In a wrench, a stockcomprising a stationary jaw and a shank extending therefrom, said" shank being provided with, rack teeth, a' movable jaw slidable upon said shank, said movable jaw being chambered, the front wallthereof being of an arcuate shape and provided with teeth, the side' walls of the jaw chamber having slots arranged to be parallel with said shank, a bifurcated lever extendinginto the jaw chamber and provided with slots inclined with respectto said shank, a spur wheel posi tioned in the jaw chamber between the lever bifurcations, and an aXle for said spur wheel, said axle engagingin both thelever and aw'slots. 7 a

"2. in a wrench, the combination of a stationary jaw, a shank therefor having teeth on one side of the same, a chambered block parallel with said shank to efieot the engagement or-di's'engagement selectively of the wheel teeth with or from the block teeth. 7 i Y Signed at- Seattle, Washington, this 18th day of September, 1919.

JAMES B. NEWLON, CHRISTIAN aonmenn.

Witnesses:

PIERRE BARNES, ELIZABETH J OHNSON. 

